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: / usr / include / boost / spirit / home / lex / lexer / lexertl /
Filename : wrap_action.hpp
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/*=============================================================================
    Copyright (c) 2001-2011 Joel de Guzman
    Copyright (c) 2001-2011 Hartmut Kaiser
    http://spirit.sourceforge.net/

    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#if !defined(BOOST_SPIRIT_WRAP_ACTION_APR_19_2008_0103PM)
#define BOOST_SPIRIT_WRAP_ACTION_APR_19_2008_0103PM

#if defined(_MSC_VER)
#pragma once
#endif

#include <boost/spirit/home/support/attributes.hpp>
#include <boost/spirit/home/lex/lexer/pass_flags.hpp>
#include <boost/phoenix/core/argument.hpp>
#include <boost/phoenix/bind.hpp>

///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit { namespace lex { namespace lexertl 
{ 
    namespace detail
    {
        template <typename FunctionType, typename Iterator, typename Context
          , typename IdType>
        struct wrap_action
        {
            // plain functions with 5 arguments, function objects (including 
            // phoenix actors) are not touched at all
            template <typename F>
            static FunctionType call(F const& f)
            {
                return f;
            }

            // semantic actions with 4 arguments
            template <typename F>
            static void arg4_action(F* f, Iterator& start, Iterator& end
              , BOOST_SCOPED_ENUM(pass_flags)& pass, IdType& id
              , Context const&)
            {
                f(start, end, pass, id);
            }

            template <typename A0, typename A1, typename A2, typename A3>
            static FunctionType call(void (*f)(A0, A1, A2, A3))
            {
                void (*pf)(void(*)(A0, A1, A2, A3)
                  , Iterator&, Iterator&, BOOST_SCOPED_ENUM(pass_flags)&
                  , IdType&, Context const&) = &wrap_action::arg4_action;

                using phoenix::arg_names::_1;
                using phoenix::arg_names::_2;
                using phoenix::arg_names::_3;
                using phoenix::arg_names::_4;
                using phoenix::arg_names::_5;
                return phoenix::bind(pf, f, _1, _2, _3, _4, _5);
            }

            // semantic actions with 3 arguments
            template <typename F>
            static void arg3_action(F* f, Iterator& start, Iterator& end
              , BOOST_SCOPED_ENUM(pass_flags)& pass, IdType
              , Context const&)
            {
                f(start, end, pass);
            }

            template <typename A0, typename A1, typename A2>
            static FunctionType call(void (*f)(A0, A1, A2))
            {
                void (*pf)(void(*)(A0, A1, A2), Iterator&, Iterator&
                  , BOOST_SCOPED_ENUM(pass_flags)&, IdType
                  , Context const&) = &wrap_action::arg3_action;

                using phoenix::arg_names::_1;
                using phoenix::arg_names::_2;
                using phoenix::arg_names::_3;
                using phoenix::arg_names::_4;
                using phoenix::arg_names::_5;
                return phoenix::bind(pf, f, _1, _2, _3, _4, _5);
            }

            // semantic actions with 2 arguments
            template <typename F>
            static void arg2_action(F* f, Iterator& start, Iterator& end
              , BOOST_SCOPED_ENUM(pass_flags)&, IdType, Context const&)
            {
                f (start, end);
            }

            template <typename A0, typename A1>
            static FunctionType call(void (*f)(A0, A1))
            {
                void (*pf)(void(*)(A0, A1), Iterator&, Iterator&
                  , BOOST_SCOPED_ENUM(pass_flags)&
                  , IdType, Context const&) = &wrap_action::arg2_action;

                using phoenix::arg_names::_1;
                using phoenix::arg_names::_2;
                using phoenix::arg_names::_3;
                using phoenix::arg_names::_4;
                using phoenix::arg_names::_5;
                return phoenix::bind(pf, f, _1, _2, _3, _4, _5);
            }

            // we assume that either both iterators are to be passed to the 
            // semantic action or none iterator at all (i.e. it's not possible 
            // to have a lexer semantic action function taking one arguments).

            // semantic actions with 0 argument
            template <typename F>
            static void arg0_action(F* f, Iterator&, Iterator&
              , BOOST_SCOPED_ENUM(pass_flags)&, IdType, Context const&)
            {
                f();
            }

            static FunctionType call(void (*f)())
            {
                void (*pf)(void(*)(), Iterator&, Iterator&
                  , BOOST_SCOPED_ENUM(pass_flags)&
                  , IdType, Context const&) = &arg0_action;

                using phoenix::arg_names::_1;
                using phoenix::arg_names::_2;
                using phoenix::arg_names::_3;
                using phoenix::arg_names::_4;
                using phoenix::arg_names::_5;
                return phoenix::bind(pf, f, _1, _2, _3, _4, _5);
            }
        };

        // specialization allowing to skip wrapping for lexer types not 
        // supporting semantic actions
        template <typename Iterator, typename Context, typename Idtype>
        struct wrap_action<unused_type, Iterator, Context, Idtype>
        {
            // plain function objects are not touched at all
            template <typename F>
            static F const& call(F const& f)
            {
                return f;
            }
        };
    }

}}}}

#endif